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I have crushed two fuel socks (last one OEM Mazda) with my return fuel system on my 1990 CSP car. This is my solution. Three stainless steel springs zip-tied to the inner crush lattice and zip-tied shut.
I am collapsing the fuel sock and at top power all the fuel must pass the small inlet hole. And it starves and makes a nice dark witness mark on the bottom of the sock.
I think this has already been mentioned here. Supposedly it is the only aftermarket option that is equally good or better compared to the OEM. At least this is what I had in mind.